10 Jun BIOL 160 – An allele is a version of a gene
Question
PreLab 7- Dragon Genetics
True or False
1. ______ An allele is a version of a gene.
2. ______ In this lab, the allele “F” fire-breathing is dominant to “f”- non-fire breathing.
3. ______ In this lab, for a mother or father dragon one of their “popsicle sticks” represents a homologous pair of chromosomes.
Multiple Choice
4. Whether an allele is dominant or recessive depends on
Whether it is inherited from the mother or the father
How common the allele is, relative to other alleles
Whether or not it is on a sex chromosome
Whether it or another allele determines the phenotype when both are present
5. Which of the following best describes why there is a 50/50 chance that a human baby will be a boy (or a girl)?
a. Because parents flip a coin, and that determines it
b. Because approximately half of sperm produced have a Y chromosome and approximately
half have an X chromosome
c. Because fertilized eggs have 22 autosomes from the mother and 22 autosomes from the
father
d. Because eggs are made via meiosis and eggs either have an X or Y chromosome
6. Use the internet- look up the term “epistasis”. Which of the following best describes epistasis-
a. Sex linked chromosomes are on the X or Y chromosome
b. When two alleles of the same gene “blend” to show an intermediate phenotype
c. The effect of one gene being dependent on the presence of one or more ‘modifier genes’,
d. There is a 50/50 chance of inheriting a dominant or recessive allele
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